I wont go find a picture of radditsu to nitpick, but..
It's pretty bad, in my own opinion. For one thing, radditsu was larger than goku..who's larger than vegeta. You're model's just too small..since you altered the vegeta model. I won't touch the hair, since it's been mentioned. The armor "covering" the shoulder's looks more like pieces of cardboard resting on the shoulders. The armor curved and covered a good part of the shoulder area.
The skin's pretty weak, too. The colors are drab, and it just looks flat.
To do the character justice, you'd need to start from scratch to get him right.
But, this is just my opinion.
It wasn't intended to be a flame, just some ciritisism.
If you can't take it as that, then don't ask for it.